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Understanding the Role of Net and Gross Flux in Atmospheric CO2 Dynamics in Tropics

This study explores the significance of net and gross flux in atmospheric CO2 dynamics, focusing on the tropics. It examines disequilibrium isoflux and its impact on D14C levels. By analyzing modern and deglacial simulations, the importance of the tropics is assessed. Methods for diagnosing isoflux and verifying balance are outlined using data from GLODAP and Rubin & Key (2001) method.

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Understanding the Role of Net and Gross Flux in Atmospheric CO2 Dynamics in Tropics

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  1. (Takahashi et al., 2009) • net flux important for atmospheric CO2, but prob. not in tropics • gross flux important for atmospheric D14C: • disequilibrium isoflux (mol C ∙ ‰ yr-1) = DD14C ∙ pCO2 ∙ kg • how important were the tropics?

  2. Diagnosing the disequilibrium isoflux • start with modern (PIPN) • verify balance with cosmogenic production estimate • deglacial simulation: holding circulation constant, scale D14C map to yield rate of atmospheric D14C decline • disequilibrium isoflux (mol C ∙ ‰ yr-1) = DD14C ∙ pCO2 ∙ kg

  3. PIPN D14C estimated from GLODAP potential alkalinity using Rubin & Key (2001) method

  4. PIPN pCO2 estimated from GLODAP total – anthropogenic DIC, GLODAP Alk, and Takahashi T & S

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